Let's talk about repairing ball marks on the putting green, and doing so properly.
I see a lot of people do this improperly. Unfortunately, many of them are PGA Tour players, and they do it on television. They put their divot repair tool in the ground, pop up, and tap down. This is the wrong way to repair a ball mark. It damages or rips the roots and the grass does not heal in a short time, taking weeks to recover.
We had an old topic on this, but it's old, and the videos and links in